<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单 -->
            <!-- 登录表单 -->
            <el-form :model="loginFormText" :rules="loginFormRules" ref="loginFormRef" label-width="0px" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input prefix-icon="iconfont icon-user" v-model="loginFormText.username"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input type="password" prefix-icon="iconfont icon-3702mima" v-model="loginFormText.password"></el-input>
                </el-form-item>
                <!-- 按钮 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
  data () {
    return {
      // 数据绑定
      loginFormText: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则
      loginFormRules: {
        username: [
          { required: true, message: '请输入登录名', trigger: 'blur' },
          { min: 3, max: 10, message: '登录名长度在3到10个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '密码长度在6到15个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 添加表单重置方法
    resetLoginForm () {
      // this=>当前组件对象，其中的属性$refs包含了设置的表单ref
      // console.log(this)
      // console.log(this._data.loginFormText.username)
      this._data.loginFormText.username = ''
      this._data.loginFormText.password = ''
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid)
        if (!valid) {
          return
        }
        // 返回promise对象， 解构赋值， 异步async函数中的await
        // console.log(this.$http.post('login', this.loginFormText))
        const { data: res } = await this.$http.post('login', this.loginFormText)
        // console.log(res)
        if (res.meta.status !== 200) {
          this.$message.error('用户名或密码错误')
          return
        }
        this.$message.success('登录成功')
        /* 1、将登录成功之后的token，保存到客户端的sessionStorage中
            1）项目中除了登录之外的其他API接口，必须在登录之后才能访问
            2）token只应该在当前网站打开期间生效，所以将token保存在sessionStorage中 */
        window.sessionStorage.setItem('token', res.data.token)
        // 通过编程时导航跳转到后台主页，路由地址是/home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style Lang="less" scoped>
.login_container {
    background-color: #2b4b6b;
    height: 100%;
}
.login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
.avatar_box {
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
}
.avatar_box img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
}
.login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
.btns {
    display: flex;
    justify-content: flex-end;
}
</style>
